Stanislas Wawrinka, of Switzerland, shouts after losing a game against to Mikhail Kukushkin, of Kaza …

''The last thing I want is to talk about it, to think about it, to discuss about it. There's a certain time and place to do that,'' Federer said at a news conference. ''The only hope I always have is that we will be healthy.''

The Swiss have never won the Davis Cup, and last reached the semifinals in 2003. Then, a Federer-led team lost to Lleyton Hewitt's Australia.

Federer converted his first match point when his opponent could not return the serve.

He also won in straight sets in Friday's opening singles against 56th-ranked Kukushkin.

On Sunday, the third-ranked Wawrinka did not allow Kukushkin any break points in the match, though lost the first-set tiebreaker after a series of misplayed forehands.

Stanislas Wawrinka, of Switzerland, reacts after winning a break game against to Mikhail Kukushkin, …

Wawrinka then used service breaks in the fifth game of the second set and opening game of the third to take control.

He forced the decisive break at 4-4 in the fourth, with a forehand crosscourt return for a winner.

Wawrinka clinched the match with his 25th ace.

Federer now takes a four-week break from competition, and is due to return at the Madrid Masters.

Asked where the Davis Cup figures in the season plans, Federer said: ''We have other priorities from now on, which are the Masters 1000s coming up, the clay-court season, then we'll see when September rolls around.''

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